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Math Help - Stats question. is there enough info to answer the question

  1. #1
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    question: suppose a certain type of factory suffers catastrophic failures in machinary at a rate of 10 per yer. (2 parts) Thanks in advance!

    what is the probablility that between 10 and 15 machines inclusive will suffer this failure this year?

    What is standard deviation of such failures in a year?

    thanks for your help!

    is this a binomial dist?
    Last edited by mr fantastic; April 5th 2009 at 10:21 PM. Reason: Merged posts
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  2. #2
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    Quote Originally Posted by si4life View Post
    question: suppose a certain type of factory suffers catastrophic failures in machinary at a rate of 10 per yer. (2 parts) Thanks in advance!

    what is the probablility that between 10 and 15 machines inclusive will suffer this failure this year?

    What is standard deviation of such failures in a year?

    thanks for your help!

    is this a binomial dist?
    You're probably meant to assume that the number of catastrophic failures per year follows a Poisson distribution (with a mean of 10).
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